It is wiser being good than bad;请详细分析一下句子结构、成分!

完整的句子：
Being good is wiser than (being) bad.
It 做形式主语,代替being good.
than
conj.
[用于形容词、副词的比较级之后]比；与…比较：
She is taller than me.
她比我高.
Thomas arrived earlier than the others.
托马斯比其他人早到.